The structure shown is a six-membered ring with oxygen, indicating a pyranose form. The anomeric carbon (C1) has the hydroxyl group pointing downward, which defines it as the α-anomer. The molecule has six carbons, so it is a hexose. Since the ring closure involves the aldehyde group (visible at C1), it is derived from an aldose, making it an aldohexose. However, the specific question asks to identify the structure, which is clearly an α-pyranose due to its ring size and anomeric configuration.

Final answer: an $\mathrm{\alpha }$-pyranose